EP2380946A2 - Composition de plaque de guide d'ondes de type résine, unité de rétroéclairage incluant la plaque de guide d'ondes formée à l'aide de la composition et écran à cristaux liquides incluant l'unité de rétroéclairage - Google Patents

Composition de plaque de guide d'ondes de type résine, unité de rétroéclairage incluant la plaque de guide d'ondes formée à l'aide de la composition et écran à cristaux liquides incluant l'unité de rétroéclairage Download PDF

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Publication number
EP2380946A2
EP2380946A2 EP11163632A EP11163632A EP2380946A2 EP 2380946 A2 EP2380946 A2 EP 2380946A2 EP 11163632 A EP11163632 A EP 11163632A EP 11163632 A EP11163632 A EP 11163632A EP 2380946 A2 EP2380946 A2 EP 2380946A2
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Prior art keywords
meth
composition
acrylate
backlight unit
shrinkage rate
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EP11163632A
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German (de)
English (en)
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EP2380946A3 (fr
EP2380946B1 (fr
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Seung Mo Hong
Kee Yong Kim
Tae Wook Kim
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Dongwoo Fine Chem Co Ltd
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Dongwoo Fine Chem Co Ltd
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    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
    • C09K19/00—Liquid crystal materials
    • C09K19/04—Liquid crystal materials characterised by the chemical structure of the liquid crystal components, e.g. by a specific unit
    • C09K19/38—Polymers
    • C09K19/3833—Polymers with mesogenic groups in the side chain
    • C09K19/3885—Polyurethanes
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
    • C09K19/00—Liquid crystal materials
    • C09K19/04—Liquid crystal materials characterised by the chemical structure of the liquid crystal components, e.g. by a specific unit
    • C09K19/06—Non-steroidal liquid crystal compounds
    • C09K19/08—Non-steroidal liquid crystal compounds containing at least two non-condensed rings
    • C09K19/30—Non-steroidal liquid crystal compounds containing at least two non-condensed rings containing saturated or unsaturated non-aromatic rings, e.g. cyclohexane rings
    • C09K19/3001—Cyclohexane rings
    • C09K19/3086—Cyclohexane rings in which at least two rings are linked by a chain containing nitrogen atoms
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
    • C09K19/00—Liquid crystal materials
    • C09K19/04—Liquid crystal materials characterised by the chemical structure of the liquid crystal components, e.g. by a specific unit
    • C09K19/38—Polymers
    • C09K19/3804—Polymers with mesogenic groups in the main chain
    • C09K19/3809—Polyesters; Polyester derivatives, e.g. polyamides
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
    • C09K19/00—Liquid crystal materials
    • C09K19/04—Liquid crystal materials characterised by the chemical structure of the liquid crystal components, e.g. by a specific unit
    • C09K19/38—Polymers
    • C09K19/3833—Polymers with mesogenic groups in the side chain
    • C09K19/3842—Polyvinyl derivatives
    • C09K19/3852—Poly(meth)acrylate derivatives
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
    • C09K19/00—Liquid crystal materials
    • C09K19/04—Liquid crystal materials characterised by the chemical structure of the liquid crystal components, e.g. by a specific unit
    • C09K2019/0444—Liquid crystal materials characterised by the chemical structure of the liquid crystal components, e.g. by a specific unit characterized by a linking chain between rings or ring systems, a bridging chain between extensive mesogenic moieties or an end chain group
    • C09K2019/0448—Liquid crystal materials characterised by the chemical structure of the liquid crystal components, e.g. by a specific unit characterized by a linking chain between rings or ring systems, a bridging chain between extensive mesogenic moieties or an end chain group the end chain group being a polymerizable end group, e.g. -Sp-P or acrylate

Definitions

  • the present invention relates to a resin-type light guide plate composition, a backlight unit including the light guide plate, and a liquid crystal display including the backlight unit. More particularly, the present invention relates to a resin-type light guide plate composition, which can make a light guide plate useful for a module-type backlight unit exhibiting excellent dimming while having a low shrinkage rate. by a simple curing process and can form a thick film, a backlight unit including the light guide plate formed using the composition, and a liquid crystal display including the backlight unit.
  • Liquid crystal displays are used in a wide range of applications, including notebook type computers, monitors, televisions, or outdoor electronic displays, because they have various advantages of a slim size, a lightweight design, low electric power consumption, and so on.
  • the liquid crystal display includes a liquid crystal panel and a backlight unit.
  • the backlight unit supplies the liquid crystal panel with light, which is transmitted through the liquid crystal panel.
  • the liquid crystal panel adjusts the transmittance of light to display on image.
  • Backlight units are classified into edge-type backlight units and direct-type backlight units depending on the arrangement of light sources.
  • the light side of the liquid crystal panel is located at the side of the liquid crystal panel is guided to the rear side of the liquid crystal panel.
  • a liquid crystal panel is provided on a rear surface of the liquid crystal panel, and is emitted to the rear surface of the liquid crystal panel.
  • Examples of light sources for LCD include electroluminescence (EL) lamps, cold cathode fluorescent lamps (CCFLs), hot cathode fluorescent lamps (HCFLs), and light-emitting diodes (LEDs).
  • EL electroluminescence
  • CCFLs cold cathode fluorescent lamps
  • HCFLs hot cathode fluorescent lamps
  • LEDs light-emitting diodes
  • the LEDs are increasingly used to provide their advantages including low power consumption and high emission efficiency.
  • FIG. 1 is a schematic configuration view of an edge-type LED backlight unit.
  • a plurality of LEDs 30 are mounted on a printed circuit board 10 and are fixed on a lateral side of a light guide plate 40-A.
  • the light guide plate 40-A allows light to be diffused from the light-emitting diodes (LEDs) 30 to be evenly spread over a wide area of the light guide plate 40-A 40-A, now providing a surface light to a liquid crystal panel.
  • the edge-type LED configuration is diminished in that local dimming is not enabled.
  • a dispersion of LEDs 30 are located in front of a printed circuit board 10 and a reflection plate 20 so that the LEDs are partially turned on / off, enabling local dimming.
  • the number of LEDs 30 may increase when it is needed to make brightness uniformity, making it difficult to effect a power consumption reducing effect of local dimming.
  • the backlight unit shown in FIG. 3 A direct-type backlight unit is used, which implements a local dimming effect while
  • the light guide plate is required.
  • the light guide plate is not limited to the number of LEDs 30.
  • the light guide plate is required.
  • Embodiments of the present invention provide a resin-type light guide plate composition, which can be used as a light guide plate useful for a module-type backlight unit simple curing process and can form a thick film, a backlight unit including the light guide plate formed using the composition, and a liquid crystal display including the backlight unit.
  • the urethane- (meth) acrylates oligomer may have a number average molecular weight ranging from 2,000 to 5,000.
  • the hydrogen bond type (meth) acrylates may be represented by the formula 2 or 3:
  • R 1 represents independently alkyl or heteroalkyl having 1 to 10 carbon atoms, cycloalkyl having 3 to 8 carbon atoms, phenyl, alkylphenyl having 1 to 10 carbon atoms, or phosphorus
  • R 2 represents hydroxyl or carboxyl
  • R 3 represents hydrogen or methyl
  • the hydrogen bond type (meth) acrylate may be acid-denatured (meth) acrylate oligomer prepared by reacting acid anhydride with (meth) acrylate monomer containing hydroxyl group.
  • the urethane- (meth) acrylate oligomer may be contained in an amount of 10 to 70 wt% based on the total weight of the composition.
  • the hydrogen bond type (meth) acrylate may be used in an amount of 10 to 40 wt% based on the total weight of the composition.
  • the acrylic monomer may be in an amount of 10 to 60 wt% based on the total weight of the composition.
  • the resin-type light guide plate composition may further include a trior or higher-functional (meth) acrylate hardener having a maximum shrinkage rate of 20% or higher.
  • the composition may include two or more kinds of the acrylic monomer and the maximum shrinkage rate calculated by the equation (2) may be in a range of 3 to 7%:
  • XnSn means the product of Xn and Sn
  • Xn denotes XnSn
  • XnSn a mass fraction of the nth monomer
  • Sn is a maximum shrinkage rate of the nth monomer, which is calculated by the equation (1).
  • the composition may further include UV stabilizer or a thermal stabilizer.
  • a light emitting diode there is a light guide plate formed on a reflection plate.
  • the light guide plate may have a thickness of 0.2 to 2 mm.
  • a liquid crystal display including the backlight unit.
  • the device of the present invention is illustrated in the form of a backlight unit, enabling local dimming.
  • composition of the present invention may be reduced.
  • the present invention provides a resin-type light guide plate composition including urethane (meth) acrylate oligomer; hydrogen bond type (meth) acrylates; acrylic monomer; and a photoinitiator.
  • LEDs in a type of module backlight unit of a type of backlight with direct access to the device can be fabricated.
  • the urethane- (meth) acrylate oligomer can control a shrinkage rate and has excellent transparency and mechanical properties.
  • the urethane- (meth) acrylate oligomer may be prepared by reacting with (meth) acrylate monomer containing hydroxyl group, the compound prepared by reacting divalent polyol with divalent isocyanate. That is to say, a compound having a terminal isocyanate group is prepared by reacting divalent polyol with excess divalent isocyanate, and the compound is is with (meth) acrylate monomer containing hydroxyl group.
  • the divalent polyol has a number average molecular weight ranging from 1,500 or greater.
  • non-limiting examples of the divalent polyol may be selected, alone or in combination, from the group of polyester polyol, polycaprolactone denatured polyol, polycarbonate polyol, polybutadiene polyol, polyisophorene polyol, polyethylene glycol, polypropylene glycol, polyethylene propylene glycol and polytetramethylene glycol.
  • the divalent isocyanate or 2,4-toluene diisocyanate and isomer thereof isophorone diisocyanate, 1,5-naphthalene diisocyanate, 1,4-xylene diisocyanate, 1,3-xylene diisocyanate, 4 , 4-dicyclohexylmethane diisocyanates, and 1,6-hexamethylene diisocyanates.
  • 2-Hydroxyethyl (meth) acrylates 2-hydroxypropyl (meth) acrylates, 4-hydroxybutyl (meth) acrylates, 2-hydroxyethyl (meth) acrylates, 2-hydroxypropyl (meth) acrylates, 4-hydroxybutyl (meth) acrylates, 2-hydroxyethyl (meth) acrylates, 2-hydroxypropyl (meth) acrylates, 4-hydroxybutyl (meth) acrylates , caprolactone-denatured (meth) acrylates, polyethyleneglycol mono (meth) acrylates and polypropyleneglycol mono (meth) acrylates.
  • a polymerization inhibitor may be used.
  • Tertiary amines including triethylamine, triethanolamine, 1,4-diazabiscyclo- (2,2,2) -octanes, N, N-diethylcyclohexylamine, are specifically selected from the group , N-methylmorpholines, and N, N, N ', N'-tetramethylmethanediamines, or tin-based catalysts including dibutyl tin dilaurate, dibutyl tin dibutoxide, di- (2-ethylhexyl) tin oxide, dibutyl tin diisooctyl maleate, dibutyl tin bis (acetylacetonate), butyl tin trichloride, and tribu
  • dibutyl tin dilaurate is used as the catalyst.
  • a small amount of a phenol-type polymerization inhibitor, including methoxy hydroquinone, hydroquinone, and t-butyl hydroquinone may be used as the polymerization inhibitor.
  • the urethane- (meth) acrylate oligomer may be represented by the formula (1); R 1 represents a structure excluding a terminal hydroxyl group from divalent polyol, R 2 represents a structure excluding a terminal isocyanate group from the divalent isocyanate, R 3 represents or n is an integer of 1 to 10, and R 4 represents hydrogen or methyl.
  • the urethane- (meth) acrylates oligomer may have a number average molecular weight ranging from 2,000 to 5,000. If the number average molecular weight is less than 2,000, the curing shrinkage rate may increase. If the number average molecular weight is greater than 5,000, the composition may have increased viscosity, now lowering workability.
  • the urethane- (meth) acrylate oligomer may be contained in an amount of 10 to 70 wt% based on the total weight of the composition. Preferably, the urethane (meth) acrylate oligomer may contain from 20 to 60 wt%. If the urethane- (meth) acrylate oligomer is contained in the composition in an amount of less than 10% by weight, a mechanical property of an adhesive agent after curing may be lowered. If the urethane- (meth) acrylate oligomer is contained in an amount greater than 70% by weight, the composition of the composition may be increased,
  • the hydrogen bond type (meth) acrylate may form an ionic bond with a base film or a physical bond with the base film by melting part of the base film, as imparting adhesion to the composition.
  • the hydrogen bond type (meth) acrylates may include, not limited to, (meth) acrylates as they are capable of forming hydrogen bonds.
  • (meth) acrylates including hydroxyl group or carboxyl group may be used.
  • the hydrogen bond type (meth) acrylate is represented by the formula 2 or 3:
  • R 1 represents independently alkyl or heteroalkyl having 1 to 10 carbon atoms, cycloalkyl having 3 to 8 carbon atoms, phenyl, alkylphenyl having 1 to 10 carbon atoms, or phosphorus
  • R 2 represents hydroxyl or carboxyl
  • R 3 represents hydrogen or methyl
  • specific examples of the (meth) acrylates containing hydroxyl group may include 2-hydroxyethyl (meth) acrylates, 2-hydroxypropyl (meth) acrylates, 4-hydroxybutyl (meth) acrylates, caprolactone-denatured (meth) acrylates, polyethyleneglycol mono (meth) acrylates, polypropyleneglycol mono (meth) acrylates, and phosphoric acid (meth) acrylates, and specific examples of the (meth) acrylates containing carboxyl group may include (meth) acrylic acid and (meth) acrylic acid dimer.
  • the hydrogen bond type (meth) acrylate may be acid-denatured (meth) acrylate oligomer prepared by reacting acid anhydride with (meth) acrylate monomer containing hydroxyl group in the presence of a catalyst.
  • the acid anhydride is preferably cyclic acid anhydride.
  • non-limiting examples of the (meth) acrylates monomer containing the hydroxyl group may be selected, alone or in combination, from the group consisting of 2-hydroxyethyl (meth) acrylates, 2-hydroxypropyl (meth) acrylates, 4-hydroxybutyl (meth) acrylates, caprolactone-denatured (meth) acrylates, polyethyleneglycol mono (meth) acrylates and polypropyleneglycol mono (meth) acrylates.
  • the hydrogen bond type (meth) acrylates represented by the formula 3 may have been prepared by reacting with a monomer having an epoxy functional group with (meth) acrylic acid.
  • a mono-functional group is preferred as the epoxy functional group. However, if the monomer has a large molecular weight, it may also be used.
  • non-limiting examples of the monomer having epoxy group may include ethyl glycidyl ether, propyl glycidyl ether, butyl glycidyl ether, polyethyleneglycol diglycidyl ether, polypropyleneglycol diglycidyl ether, phenol glycidyl ether, nonylphenol glycidyl ether, polybisphenol A diglycidyl ether, polybisphenol Diglycidyl ether, polybisphenol diglycidyl ether, and polybisphenol AD diglycidyl ether.
  • a catalyst may be used.
  • the catalyst may include tertiary amines, quaternary ammonium, inorganic alkali salts, phosphorus-based catalysts.
  • the catalyst may include triethylamine, pyridines, trimethylamines, tributylamines, triethylamine benzyl chlorides, triethylamine benzylbromides, tributylamines benzyl chlorides, tributylamines benzylbromides, tetrabutylamines chlorides, tetrabutylamines bromides, triphenylphosphines, and chrome octates.
  • a compound represented by the formula 2 to 4 may be used as the hydrogen bond type (meth) acrylate alone or in combination.
  • the hydrogen bond type (meth) acrylate may be present in an amount of 10 to 40 wt% based on the weight of the composition, preferably in an amount of 15 to 35 wt%. If the hydrogen bond type (meth) acrylate is contained in an amount of less than 10% by weight, sufficiently high adhesion may not be achieved. If the hydrogen bond type (meth) acrylate is contained in an amount greater than 40 wt%, the composition may be lower.
  • the acrylic monomer reduce the viscosity of the composition for improving workability while not adversely affecting physical properties of the composition.
  • the acrylic monomer may have a maximum shrinkage rate ranging from 3 to 10%. If the maximum shrinkage rate of the acrylic monomer is less than 3%, the reactivity is too low to increase the curing degree. However, the curing rate is low. The curing speed is high.
  • the maximum shrinkage rate represented by the equation (1) is based on the assumption that the curing degree is 100%.
  • the shrinkage rate is represented by the equation (1) and the product of the maximum shrinkage rate represented by the equation (1) and the curing degree is equal to the shrinkage rate represented by the equation (A).
  • 15% may include 2-phenoxyethyl acrylate (13%), cyclictrimethylol propane formalacrylate (12.4%), tridecylacrylate (9.2%), octyldecylacrylate (12.6%), isobonyl acrylate (11.8%), 2- (2-ethoxyethoxy) acrylate (13.4%), isodecylacrylate (11.6%), caprolactone acrylate (6.1%), laurylacrylate (9.9%), stearic acrylate (6.7%), methoxypolyethylene glycol 600 monoacrylates (2.1%), nonylphenolethylene oxides (4 mol) acrylates (4.1%), nonylphenolethylene oxides (8 mol) acrylates (2.2%), methoxypolyethylene glycol 600 monoacrylates (1.8%), isodecylmethacrylates (10.7%), stearic methacrylates (6.3% ), 2-phenoxyethyl methacrylates (12%), isobonyl methacrylates (11%), and tride
  • the acrylic monomer may be in an amount of 10 to 60 wt% based on the weight of the composition. Preferably, the acrylic monomer is contained in an amount of 20 to 50% by weight on the weight of the composition. If the acrylic monomer is contained in an amount of less than 10 wt%, the viscosity of the composition increases, and If the acrylic monomer is contained in an amount greater than 60 wt%, an mechanical property may be reduced,
  • the photoinitiator changes a liquid type resin into a solid type resin by light irradiation.
  • the photoinitiator can be classified as a type 1 initiator that produces a hydrogen abstraction type initiator in cooperation with tertiary amine.
  • the type 1 initiator may include acetophenones, such as 4-phenoxydichloroacetophenones, 4-t-butyldichloroacetophenones, 4-t-butyltrichloroacetophenones, diethoxyacetophenones, 2-hydroxy-2-methyl-1-phenylpropane-1-one, 1- (4-isopropylphenyl) -2-hydroxy-2-methylpropane-1-one, 1- (4-dodecylphenyl) -2-hydroxy 2-methylpropane-1-ones, 4- (2-hydroxyethoxy) -phenyl (2-hydroxy-2-propyl) ketones, or 1-hydroxycyclohexyl phenyl ketones; benzoin such as benzoin, benzoin methyl ether, benzoin ethyl ether, benzyl dimethyl
  • Type 2 initiator may include benzophenones such as benzophenone, benzoylbenzoic acid, benzoylbenzoic acid methyl ether, 4-phenylbenzophenones, hydroxybenzophenones, 4-benzene-4'-methyldiphenylsulfides, 3,3'-methyl-4-methoxybenzophenones; and tioxantones such as tioxantone, 2-chlorotioxantone, 2-methyltioxantone, 2, 4-dimethyltioxantone, or isopropyltioxantone.
  • the photoinitiator may be used alone or in combination of these compounds.
  • a Type 1 initiator and a Type 2 initiator may be used in combination.
  • the photoinitiator may be contained in an amount of 0.1 to 10 wt% based on the weight of the composition. Preferably, the photoinitiator is contained in an amount of 0.2 to 3 wt% based on the weight of the composition. If the photoinitiator is contained in an amount of less than 0.2% by weight, If the photoinitiator is contained in an amount greater than 3 wt%, poor adhesion or brittleness may be due to.
  • a trior or higher-functional (meth) acrylate hardener may be used.
  • the trior higher-functional (meth) acrylate hardener may have the maximum shrinkage rate of 20% or greater, represented in the formula (1).
  • Specific examples of the trior higher-functional (meth) acrylate hardener may include glycerol propyl added tri (meth) acrylates, ditrimethylol tetra (meth) acrylates, dipentaerythritol penta (meth) acrylates, pentaerythritol tri (meth) acrylatorethanes oligomeric reacting with diisocyanate, and dipenta (meth) acrylates urethane oligomer reacting with diisocyanate.
  • the trior higher-functional (meth) acrylate hardener may be contained in an amount of 1 to 5 wt% based on the weight of the composition. If the trior or higher-functional (meth) acrylate is more than 1 wt%, the curing efficiency may become poor. If the trior or higher-functional (meth) acrylate is more than 5 wt%, then the curative and mechanical damage.
  • the resin-type light guide plate composition may further include UV stabilizer and a thermal stabilizer when necessary.
  • the UV stabilizer blocks or absorbs UV rays by UV exposure to the hardened composition.
  • the UV stabilizer may be included in an absorbent, a quencher, and a hindered amine light stabilizer (HALS) according to the reaction mechanism.
  • HALS hindered amine light stabilizer
  • the UV stabilizer may also be classified into phenyl salicylate (absorbent), benzophenone (absorbent), benzotriazole (absorbent), nickel derivatives (quencher), and a radical scavenger.
  • any UV stabilizer can be used without limitation, unless it changes to an initial color of the composition.
  • Polyphenols, phosphites, and lactones which may be available, may be used as the thermal stabilizer.
  • the UV stabilizer and the thermal stabilizer can be used as such.
  • the resin-type light guide plate composition according to the present invention is not impaired.
  • the resin-type light guide plate composition may include two or more types of acrylic monomers.
  • the maximum shrinkage rate calculated by the equation (2) may be in a range of 3 to 7%:
  • XnSn means the product of Xn and Sn
  • Xn denotes XnSn
  • XnSn a mass fraction of the nth monomer
  • Sn is a maximum shrinkage rate of the nth monomer, which is calculated by the equation (1).
  • the maximum shrinkage rate increases, the adhesion is reduced and the curing is facilitated. If the maximum shrinkage rate decreases, the adhesion is enhanced and the curing is moderated.
  • the curing degree based on UV irradiation has the same propensity as the shrinkage rate. That is to say, the composition having the maximum shrinkage rate of less than 7%. Accordingly, curling due to post-curing may be applied during various tests carried out at high temperatures.
  • the present invention thus provides a backlight unit including LEDs, and a light guide plate formed on a reflection plate using the composition according to the present invention to cover the LEDs.
  • FIG. 3 is a schematic configuration view that illustrates a local dimming enabling, module-type LED backlight unit, which is a combination type of edgeand direct-types.
  • the backlight unit includes a printed circuit board 10, a reflection plate 20, LEDs 30, and a light guide plate 40-B.
  • the backlight unit may further include a diffusion plate, a diffusion film, a focusing film, and a reflective polarizing film, which are stacked on a top surface of the light guide plate 40-B.
  • LEDs are arranged on the entire surface of the printed circuit board 10 and the reflection plate 20, making it difficult to mount the light guide plate ,
  • the light guide plate 40-B may have a thickness in a range of 0.2 to 2 mm.
  • the light guide plate 40-B converts to a light source, and has excellent adhesion while demonstrating reduced shrinkage and little change in the color coordinates.
  • FIG. 4 Emission of light from LEDs in a state in which a device according to the present invention is not used in forming a light guide plate
  • FIG. 5 Emission of light from LEDs in a state in which a device according to the present invention is used in the form of a light guide plate.
  • FIGS. 4 and 5 A light source in a surface light source.
  • the present invention thus provides a liquid crystal display including the backlight unit.
  • the liquid crystal display includes a backlight unit including a light guide plate formed using the composition according to the present invention.
  • the liquid crystal display may or may not be used in the liquid crystal display.
  • Resin-type light guide plate compositions have been prepared in the synthesis examples using compositional contents listed below in Table 1 by the method that is well known in the art.
  • compositions prepared in examples and comparative examples were coated on a structure shown in FIG. 4 to a thickness of 1.5 mm, primarily hardened by a black light bulb having an intensity of 350 mJ / cm 2 under a nitrogen atmosphere, and secondarily hardened by a metal hydride lamp having an intensity of 1 J / cm 2 , fabricating test specimens.
  • the fabricated test specimens were subjected to T tests using UTM manufactured by Instron Corp. The adhesion was measured at a rate of 2 mm / min. Adhesion between glass and metal was evaluated using the average of the measured adhesion values and the evaluation results are shown in Table 2.
  • test specimen fabricated in the same manner as described in Experimental Example 1 What separates from a base film to be adhered to a glass panel. In a transmission mode to obtain ⁇ E * ab. The results are shown in Table 2.
  • test specimen fabricated in the same manner as described in Experimental Example 1 was placed in a CT-UVT equipment (UV-B, 280 ⁇ 360nm) manufactured by Coretech, Korea for 100 hours. Then, at initial color value measured using a spectrocolorimeter SE200 manufactured by Nippon Denshoku Ind. In a transmission mode and a color value after the test light. The results are shown in Table 2.
  • AE * from .DELTA.L * ⁇ 2 + .DELTA.a * ⁇ 2 + .DELTA.b * ⁇ 2 ⁇ 1 / 2
  • the specimens were fabricated in the same manner as the specimens fabricated to measure.
  • the fabricated test specimens were placed in a temperature and humidity chamber (60 ° C, 95% humidity) and allowed to stand for 500 hours, followed by measuring color values. Differences between the initial color value and the color values measured after the test were represented as ⁇ E * ab values. The results are shown in Table 2.

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  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Organic Chemistry (AREA)
  • Macromonomer-Based Addition Polymer (AREA)
  • Planar Illumination Modules (AREA)
  • Light Guides In General And Applications Therefor (AREA)
  • Liquid Crystal (AREA)
  • Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
EP11163632.0A 2010-04-23 2011-04-26 Composition de plaque de guide d'ondes de type résine, unité de rétroéclairage incluant la plaque de guide d'ondes formée à l'aide de la composition et écran à base de cristaux liquides incluant l'unité de rétroéclairage Not-in-force EP2380946B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR1020100038023A KR101007769B1 (ko) 2010-04-23 2010-04-23 수지형 도광판용 조성물, 이로 형성된 도광판을 포함하는 백라이트 유닛 및 상기 백라이트 유닛을 구비하는 액정표시장치

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EP2380946A2 true EP2380946A2 (fr) 2011-10-26
EP2380946A3 EP2380946A3 (fr) 2013-04-10
EP2380946B1 EP2380946B1 (fr) 2014-08-20

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CN102234360B (zh) 2014-08-27
EP2380946A3 (fr) 2013-04-10
JP2011252144A (ja) 2011-12-15
CN102234360A (zh) 2011-11-09
US8319913B2 (en) 2012-11-27
JP5397918B2 (ja) 2014-01-22
US20110261288A1 (en) 2011-10-27
EP2380946B1 (fr) 2014-08-20
KR101007769B1 (ko) 2011-01-14

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